<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Sep 4, 2013 at 4:37 AM, Richard Welty <span dir="ltr"><<a href="mailto:rwelty@averillpark.net" target="_blank">rwelty@averillpark.net</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div>On 9/4/13 7:16 AM, <a href="mailto:dies38061@mypacks.net" target="_blank">dies38061@mypacks.net</a> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
>From the page which Bryce referred to in <a href="http://lists.openstreetmap.org/pipermail/talk-us/2013-September/011738.html" target="_blank">http://lists.openstreetmap.<u></u>org/pipermail/talk-us/2013-<u></u>September/011738.html</a> comes the following passage:<br>
<br>
"The term ZCTA was created to differentiate between this entity and true USPS ZIP Codes.<br>
ZCTA is a trademark of the U.S. Census Bureau; ZIP Code is a trademark of the U.S. Postal Service."<br>
<br>
Therefore, ZCTA information _approximates_ ZIP information for census purposes. If you want to map/use ZIP code information, don't use the ZCTA information to do it, I would infer.--ceyockey<br>
<br>
</blockquote></div>
any area-oriented representation of zip data will be an approximation.<br>
it's the nature of the beast.</blockquote><div><br></div><div>+1 on that. ZIP codes are not as simple as they seem.</div><div>For a great <i>animation</i> of what a ZCTA is, see:</div><div><a href="http://www.census.gov/geo/ZCTA/zcta_delineation_animation.html" target="_blank">http://www.census.gov/geo/ZCTA/zcta_delineation_animation.html</a><br>
</div><div>The census bureau was compelled to build an alternative to pure ZIP codes for all the reasons cited so far and more.<br></div><div><br></div><div>Note that ZIP codes change also: a few thousand a year are adjusted according to USPS. Some zip codes even cross state boundaries. They frequently cross county and city lines.</div>
<div><br></div><div>See <a href="http://www.carrierroutes.com/more-zip-code-faqs.html#zipcodemapping" target="_blank">http://www.carrierroutes.com/more-zip-code-faqs.html#zipcodemapping</a></div></div></div></div>